Irish Sailing Academy 

Weather & tide sites:

Met Eireann
Irish weather forecast
Wind guru
Detailed wind forecast for 7 days
Synoptic Charts
Synoptic charts for Ireland
Tides
Tidal predictions

Boating organisations:

ISA
Irish Sailing Association
IWAI
Inland Waterways Association of Ireland
Irish Water Safety
Promoting Water Safety in Ireland
RNLI
Royal National Lifeboat Institute
Club Powerboat
Web based club / chat forum for boat users in Ireland

Other training centres we recommend:

DMG Sailsports
Powerboat & windsurfing training centre